This document is one volume of a sixteen-volume report presenting an overall assessment of the particulate problem, which was conducted by GCA/Technology Division for EPA. This particular document is one of fourteen single-area volumes that provide working summaries of data gathered in the fourteen urban areas studied. These city reports primarily provide documentation and background information for Volume I of the study - National Assessment of the Particulate Problem - Final Report. Volume I should be considered the primary output of the report. The report summarized herein presents the analyses of the particulate situation in the Seattle area conducted as part of the study for the national assessment of the problem of attainment or nonattainment of the National Ambient Air Quality Standards for particulates. Seattle represents a moderately industrialized area, with above average heating requirements and a definite rainy season, that has had some success in reducing emissions and particulate concentrations though not enough to attain the standards. Fugitive dust problem, analyses of the air quality levels, emissions, regulations, monitoring network, and meteorology, are included in this report. The major findings in each of these areas are summarized below in the order in which they appear in the text.